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The viscosity of magma affects its ability to flow. For Krakatoa, the magma was characterized by high viscosity due to its high silica content, causing pressure buildup leading to explosive volcanic eruptions. The high viscosity of the magma at Krakatoa contributed to the violent nature of its eruptions in 1883.
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What was Krakatoa's viscosity?
Krakatoa's magma viscosity was estimated to be relatively low, indicating it was more fluid-like. This low viscosity contributed to the violent explosive eruption in 1883, producing devastating volcanic events such as pyroclastic flows and tsunamis.
Did Krakatoa have high viscosity lava?
No, Krakatoa is known for its explosive eruptions due to its low-viscosity lava. This type of magma allows gas bubbles to rise quickly to the surface, resulting in powerful and destructive eruptions.
What does viscosity have to do with eruptions?
Viscosity of magma affects the explosiveness of volcanic eruptions. Magma with high viscosity traps gas bubbles, increasing pressure, leading to more explosive eruptions. In contrast, low viscosity magma allows gas to escape easily, resulting in less explosive eruptions.
Is ultramafic magma high in viscosity?
No. Ultramafic magma would have a low viscosity.
Which conditions make for a violent volcanic eruption?
Magma with low viscosity
What was Krakatoa's viscosity?
Krakatoa's magma viscosity was estimated to be relatively low, indicating it was more fluid-like. This low viscosity contributed to the violent explosive eruption in 1883, producing devastating volcanic events such as pyroclastic flows and tsunamis.
Did Krakatoa have high viscosity lava?
No, Krakatoa is known for its explosive eruptions due to its low-viscosity lava. This type of magma allows gas bubbles to rise quickly to the surface, resulting in powerful and destructive eruptions.
What does viscosity have to do with eruptions?
Viscosity of magma affects the explosiveness of volcanic eruptions. Magma with high viscosity traps gas bubbles, increasing pressure, leading to more explosive eruptions. In contrast, low viscosity magma allows gas to escape easily, resulting in less explosive eruptions.
Is ultramafic magma high in viscosity?
No. Ultramafic magma would have a low viscosity.
Does Krakatoa make pillow lava?
No. Pillow lava is basaltic, low-viscosity lava. Krakatoa is a stratovolcano with a style of ereuption more characteristic of high-viscosity andesitic lava.
Which conditions make for a violent volcanic eruption?
Magma with low viscosity
What is meant by the term viscosity when used in describing magma?
Viscosity in magma refers to its resistance to flow. Magma with high viscosity is thick and sticky, flowing slowly, while magma with low viscosity is more runny and flows more easily. Viscosity is influenced by factors like temperature, silica content, and gas content in the magma.
What 3 factors determine magma viscosity?
Temperature: Higher temperatures result in lower viscosity since the magma is more fluid. Composition: Silica content influences viscosity, with higher silica content leading to higher viscosity. Gas content: Higher gas content increases viscosity as gas bubbles create resistance to flow.
What mainly determines the viscosity of a magma?
Viscosity is the measure of a liquids resistance to flow. In the case of magma, the hotter it is, the lower the viscosity.
Compare and contrast the three types of magma?
Basaltic magma is low in silica and fluid, resulting in low viscosity and eruptions that are generally less explosive. Andesitic magma has a moderate silica content and viscosity, leading to eruptions that can be more explosive than basaltic. Rhyolitic magma is high in silica and has high viscosity, causing very explosive eruptions.
What is the volume of Krakatoa's magma?
the volume is 1800 mph
Why do eruptions in Hawaii differ from Mt. St. Helens eruption?
The magma of the Hawaiian volcanoes has a basaltic composition, which means it has a low viscosity (it flows easily) and so can erupt easily without needing too much force behind it. This low viscosity magma cannot hold very much gas and so erupts effusively By contrast, the magma involved in the 1980 eruption of Mount St Helens had a dacitic composition, which has an extremely high viscosity. The high viscosity allows large mounts of gas to be stored in the magma under pressure. When the magma was exposed to lower pressure near the surface, the gas was released and expanded explosively, blasting the magma into ash and pumice.
